Help! RBY Evolution Editing!

I'm honestly going crazy, hex editing is just not my thing! I've been watching/reading tutorials over and over and I just don't get it :\What I am trying to do is have Kadabra, Haunter, Machoke and Gravler evolve on a certain level. Simple right? No! I've been trying for a long time it's killing me!.If anyone can give me step by step directions (in detail!) it would be greatly appreciated. I know, I know I'm an idiot -.-Also, if there is maybe a tool to make my life easier than anyone knows about? I've searched everywhere... Please Help!